SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808f89e297b4255e118b83f2c2f27779d28628fd41792abdf8e66b3a84954c36' 
  AND token = 'CWX3RhDMM01ClxQPYqL75Q5GR8dV/SYvupM6B/k3WFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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