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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb3ed5e4fad368c783d1080d3139d6fbef5336fce70dbc4e7e7bad62482d705' 
  AND token = 'TwqJ8b3+ch9Qg7B+ETJFW9CBs3YUByEnV0hN9CclTRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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