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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90113f83e36b8743ba1d77959d0ab6016d6eb4e98115bb2644e84887f4546ece' 
  AND token = 'of3GjtMYVRuvOQ+RwwWewMDMeQ0BuB23dATdGw3iIG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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