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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd688263b10f8f66abca8e67b0995b28880e6da11421878ec625a5f070c104462' 
  AND token = '6/IcODeh38xVNbIYU5tZ/WoQ9CZCr7w2yLqq3KkMBCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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