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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47719277c40e880b54dd4e1b6f41c5cf71f95a84047939b0f7234a0993f432b' 
  AND token = 'aFe/t0YmLhlSgfVvm+lgyu1WLOxITt9tKXGI61XV1VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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