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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fe591f8f648aef31ba5fa109e6dc52d43b54780fd5df77bed8b6d5eb263d2e' 
  AND token = 'fCAR4Le+uzq89yM3Dder6uSxGafPe6lOq7oXPoNPkZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}