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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460a64cff150745189e2d38d395a8ebc84f7792ebf0bdfd33a3f6bd2566957fa' 
  AND token = 'vS5Od9rWQ3uYpTEskcklfUcPQOOxKeXxW9fxj0nbve4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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