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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fba762fb580f1cf402abddb1addbcb5b00a3b44e5d2841775cb408b3112b09' 
  AND token = 'g+4HejEqYvsLGpeNHCO1dZ0NNwZln46lXwFJhgZajDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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