Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64d2df7509a5f7ee55aaf085785ad6b4876576556cb7d16bdba94c1e9e850c0' 
  AND token = 'Ho1+t0fyI5z9x3NAzPvkamJgjRpLnyt+Fr4Wuigx06Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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