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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeb96decbc23cea864cfb68a804c582d956b761db8096a58e1731e1d7c985df' 
  AND token = 'OHzPlZDwoFHFvueL143+pttEOXBDuNi3OCm8iXa1L40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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