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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c837161e06838a3066d67c8e5e49fa52cef2fd307f68da440ba8f5b60c1e7af' 
  AND token = 'lov5rPyD367O3TG1afcpY2RJXQFzJNq4fehLbpsXnng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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