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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578797354b7b8f7dcb200ae8b84c282703a8f30b39869afaa2324ac3c4f58406' 
  AND token = 'agii9x+elcwVkTHqO/NPaqM5/Lv3wplTT2xa3Tpr8Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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