SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a0f84c9fe7189d8fe2176f22c483777da6acce654396fdd008cb0fe3f5e219' 
  AND token = 'IJzVX2KRgCJ+U9qwMRgWqvErtyPZAjufo3yF9nGRSyY=' 
  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"
    }
  }
}