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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b913694a1d1d63435ce135c24d0b2ea0a84915cc925afd18b3ce2d52d4d2156' 
  AND token = 'mk99zpMV1GygI/yNM2gGey4rd56OlZrDpUw1QDVSK1w=' 
  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"
    }
  }
}