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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece822193c08bd489632fc4bf6ab06ca62289a1b3ee60960d981b6c376480dce' 
  AND token = '/yPCkBCj6/woRWeanfOej2wBpk4jwUy/bLESEKXz8O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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