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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2213e70b7dc499c4d874bb7676d3d081676e7a842ab14aab9fe668a9ba3d1be2' 
  AND token = 'gZnDqbiMjwkaeirjrjDjREPtW+fDpmW1CZQ/qZ66k/M=' 
  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"
    }
  }
}