Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6128ce5b4b719b0cd708c60481fb322fa1c580956a652688f7acf37c91a1aa2' 
  AND token = 'fU4T4s2DiONYzMfR8bYmvDC2stybmvq9Ble1OPCNy3U=' 
  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"
    }
  }
}