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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d035c8a5f672f02de5b2711b83e175ad0a602642a24be91ba97db6a8845e6a' 
  AND token = 'snslNA3J5FG8SwJttCaOuDUsDJOO+TQY6BJazYsNim8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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