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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa102136a5dd6c202587b13055584b110e13736800256910d73e2dc5d2affdb' 
  AND token = 'Bodw/T9009GtNugQlbQE0EeEih4+I4GzpWs05YpKi+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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