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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dd30c27880708ed43fb714c3740dc620e1fee018f510fcb1381c7a210e212f' 
  AND token = 'XKOsurUQO3REp8OoYhpi6og6nxCFqOaQKO0X16BFFOs=' 
  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"
    }
  }
}