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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d40f88ac3fc6295f4c55922830b81877620bf4e4d6272fb65b81f66a4316ffb' 
  AND token = 'YG+SwSlfD59g/JoVkgxiLEtxYPweMe2tY8nl0SXlBeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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