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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b4d52c6ee8ac81165e83ef8e05d9e11bdf81698da3a114750b6e523f70be21' 
  AND token = 'Y8LfU8T6Z1+lc85M+PqoPYSEj/5MqpccO8B//qFgVKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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