SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0e268d0f50597b4ade2e5521ee2725567ca903d80fc38c1379f338f2be21a1' 
  AND token = 'mfSHfnwCHrhwnFtPofFqF0eGsECazZx+Vj4grsDPB+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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