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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756cd531df865580050a623ce5044fc46b9e4462095177dae5402ed513f98b66' 
  AND token = '2qDR0Mz8RbEfp5bslvNNhGGc2mOJkLi4W8mrowbOzyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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