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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c62054a67d3e3fca8b8471fe3701422e82ecd5dc1bb44b8466b13819f1166e' 
  AND token = 'nD9tqGkQYFS8X54cd8G7coVxAGIAMUT9ALSqoVhgxuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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