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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308545496e4756483e9a2787fd7b5890205db40c48df9f786dc884a8141bea72' 
  AND token = '8Syff5cZSeLEOtV8jX0AlToVAzhp5izDgrzSpLzenwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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