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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a425ae721a9ee58fc9c1644f3a876ce5e2317c3cc8756187eae6cbb466c3ba0' 
  AND token = 'MgUG5HiZMdaAo1SAndY8wVnDsLLigL7Ox2MYwCfDgQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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