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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dea39c24aa40c339cceee6229f348f75cf8c401464194781c58fb7226c67c1' 
  AND token = 'tlAsQ42HoaluyPSM70v+BOZqSMemZHTWa/RnMH/o4c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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