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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9287c38d8a9f1fbda738e3d07c44828a0bdc1d6e9602a8f7a824933faf32d21f' 
  AND token = '0MPwi2BrX1moaXSe5/5exJDPC65ecL4Srfcew2tcNGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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