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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ff39042c99565fbc72a029f5e10f63b0efb4dd83b0fe7527e9d1c7603a08a4' 
  AND token = '6qaFNf2zd7Bg8Z/4DX0AZCSBlGIDFnsPamqtwI0yDaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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