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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd03e3ef2e93a91f6137f9ba9b342bcbd193b674d412fdab75d52ce40c2c05b9' 
  AND token = 'zHljHVtP8SswwuCMnFnhMeh5MM+aWm/PPEQEXuJxNbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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