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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd23b4105c4ed4b59133bc2e2d1d5eb087028d7e7d387fca9cebf57454ad049c' 
  AND token = 'NRRQLeHmT2yxNM8vVdvsI5R9S940AgH9p3HNy7j+qO0=' 
  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"
    }
  }
}