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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796adb29523ae7c4d4c216a59e6372bf4fc754b81eee226dc0e4d785e12e6105' 
  AND token = 'Y1Gs58cv0xh69+fBYOfgB1Z9KdrfohxdsbJZLfGiRi4=' 
  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"
    }
  }
}