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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74d967bcf4c17078db67866b67ed5a611556685e54301b0de83a522987766a7' 
  AND token = 'Pitdu70W6+EbdICEIX3ACC33wHKzbG8bKdZfuL9NYYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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