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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed6e472dbae0dc2704ba4f825427e5b6359aab8a68923c30c767194c3eb584b' 
  AND token = 'L2zoisSw4Vj8FIsj70YaDh8r2ZrDTvmkkfLEJ8TPauU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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