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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59023901b64b9a463a7fc85928629e8b5e580cad5a73115076f2ed87b93c890e' 
  AND token = 'QDQ36yN9MgVZ04ggzZapAu8pcsG7E3O4pnXo+OV5kGs=' 
  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"
    }
  }
}