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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04fa92238820e889de28c5305500a939fa4d9a8a8d91e1de7b83fb1f80a7e7e' 
  AND token = 'oSv/t+QsekUE1x1GVVX8pID7fl+yWcgMYD2+Ts5TExg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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