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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9ca398c90e1fc45f473e5d94ec654ee54a532784e80377c4b98ddb014ba6e6' 
  AND token = 'adei4TKuQ95P/3TWIsNzk37p8w6GAsMNG703CDJe/1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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