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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470395f0ee09fc2f6f65defc8056f001556389f48f13daa518cc610585720ae0' 
  AND token = 'RxN9RAnN0bNqdrmbA6hUYOyOGrf+V6ZPGEAcha5GrAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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