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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d923ea58e773fd88aa973d84adbeda87b457033594cc0e2849c95f605d13aa2' 
  AND token = 'BU9ZRnRTOpk/Xhre/VBdFHMBcONwtf1DuIJ4/A5mQDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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