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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14f394b402c98afe2cbaafb082522fb1670a68e9bc0b797d868981511c69fe6' 
  AND token = 'YXwbrE1kfn8zs7e/86lzrAQfn6G3EvBy0LsUhh2jT1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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