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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ced009c18ab26f601ed5efd95221bb927a2c8d85e61de0559bc503505e3b395' 
  AND token = 'pU5a6SzTZB7CA4l4L4jVrmNaLaRYzp9xLT72zhMS2+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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