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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6a7c5f301badc1f6ca620126ec949c75f880a4f5c6f95c8bb59c363a10ddb3' 
  AND token = '3TDyJKe3t55nfYBYxyt16qYQ3rWaCze+3sGisVq5cNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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