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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b44bdc5767899761595109688f1ae7f0e6d7bd8b6c97af9880f06578f7881da' 
  AND token = 'U7it/HR60802AnYIDYPjxFgR0hhK35dv+QB4ZgIPnvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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