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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4eccfd6a2096c9c323b2550920c92a7dd104853b5d94eee53af6171a8cdc8e5' 
  AND token = 'ConpFzJqZJHBsfqpPzDwLerk+1baLD350B1W1Z+eCaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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