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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c7cbf56ea158d2d6ddaafe7b4d50624dd21cadfdfc628051087a9d7d7eeb3a' 
  AND token = 'Im0A6Q91Hdq6vsoV4P9IY5vpEpIKFGmw8F9uo86s+kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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