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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e43c5e7305e2a774827ea13eb9b75eac6b1523178199b3175b4f8738a9e442' 
  AND token = 'W8sdiwmqfpaRSSsJRXKpxNjVZUrraH+/YoqAoLLjPPc=' 
  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"
    }
  }
}