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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27762d3c3b36bb7227ba4821a4f1ffb75432a03736cace228d948d2755203eda' 
  AND token = 'argeXFIEf4ex3hRMu8TkwJ+sffzZD7fD3lt+/54Tf2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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