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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caff7055225bba2438194cbc5e895c867ceb35bbe0c7845af3810d1ed586ce17' 
  AND token = 'fq3gt98zNLhaC7WKW23hquf2XcaLzMYBpSuKT6GNeCU=' 
  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"
    }
  }
}