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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3cfa0c7c8a848c79c4a180e60372c96e65b214a2edf5ec6272c81abb419f7b' 
  AND token = 'k3kxGrNl/fR5MU7sFV8f7cqvDXbAJ2RXf/F0dX6Rlg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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