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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595b86eadae4163828ba39c3230fedbc43e1c0a41df567bbc77fefe4b50228f3' 
  AND token = '+NFak8b0jmN0mt803CW5LvdGhnuj5HAMQ1F8AJyjCRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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