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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26913318492551fea4592f8b9d9e14eced1758e315e655e058ebece02e15ec3' 
  AND token = 'fnfD134MSoskuj/v/aUzEOGxzuX0qlaz9F/A8qId6sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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