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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bee660be646f77a38ef637505b01a94e886f2d5c54f96d956bb1cca18307ae' 
  AND token = 'D2RASgCIBHOKmiD2IdrDm6kL0HtA4qp1Amtldnf1y1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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