SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdfc2340442581cd40225b2c08b2d5dc7907ab2b8fe4a767a834d263607bd9f' 
  AND token = '4r53nEAhu+zp3+Wx+FDk1hRLZYwXZJFVEsIXp7rYi7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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