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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e1899d3ccac12f28f70fd57051d1cae340a250df050aceeba1d43dd658dd6b' 
  AND token = 'MyWnKY/IeMTR3xpdnWsR3Gvfj7pRohkVo4q9XwMQtY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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