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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e55db3e3ae7cb367334c3110a3d248a10495ca3c4912a02acb88c12778b5dd1' 
  AND token = '/Rf9/aX+5atyI7uXWTvdRAsd6AF/W/FmONQ32G1A5Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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