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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e421b1ba6a34b7e9246e3034238a6c02ce42a8e529a20342412fc85556edfa0' 
  AND token = 'ukg8D0AB7v6djslNODmU+yuo3P/oijC7W284O0XlPjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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