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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e373c8ab30f97b68d3b05c174752c398ffdb71d4fa3bdbdcbf7deab7e9be7dd' 
  AND token = 'FXETNveJOum+AgzY4xhAeB42tPa71Nr6jVJq1nqdQec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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