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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68893d749f9e28769de3345ea7056fb8a6c17b1ddeb12b0c010988d7c54d0841' 
  AND token = 'TQsf4HbMro/kCgUzt4M6SO5Fhrl54mkxbqrix1cC8Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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