SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae1f5d4d83cefb1691e00732d65723b5129d5cd31f607a1b72e91d2ab3a802b' 
  AND token = 'MPkWXzrjM3KZoDkJIVrhqnHb7qSm+4jnYwCeKdD4mak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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